JPH06237493A - Controller for remote control transmitter - Google Patents

Abstract

PURPOSE:To eliminate the need for changeover of a kind of a coded processing format in response to a set to be remotely controlled by the user by encoding sequentially key codes by plural predetermined kinds of formats. CONSTITUTION:A CPU 11 reads an operated key 23 and reads data of a 1st coded format from a key code data table and makes transmission in the 1st coded format. Then the CPU 11 reads data in a 2nd coded format and encodes the key code suitable for the 2nd coded format and sends it. Similarly the CPU 11 reads data in a 3rd coded format and encodes the key code suitable for the format and sends the resulting data. Then a flip-flop 3 is reset and the mode restores to the power-down mode. If he same key is continued to be depressed, thereafter the similar processing is executed again from the initial processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control transmitter control device for use in, for example, a remote control transmitter that controls a home electronic device to perform a predetermined operation.

[0002]

2. Description of the Related Art Conventionally, in a remote control device using, for example, infrared rays, a remote control transmitter encodes a code corresponding to an operated key switch in a predetermined format, modulates a carrier signal with the encoded signal, and Is configured to be transmitted by an infrared signal. On the other hand, when the remote control receiver receives a signal string encoded in a specific format, the remote control receiver is configured to perform control according to the code. Such an infrared remote control transmitter and receiver are so-called AV
It is widely used in household electronic devices such as appliances and air conditioners.

However, since the encoding format is different for each manufacturer or each set, there is the trouble of operating different remote control transmitters for each set. So, for example, in the case of TV remote control transmitters, remote control transmitters of various companies that have only the functions of the main keys having the same function and can be used as remote control transmitters for TV of multiple companies will be sold separately. It has become.

[0004]

However, as described above, in the remote control transmitter capable of supporting a plurality of types of coding formats, the switching operation is performed so that the remote control transmitter is coded in the format according to the set to be remote controlled. The format types must be matched correctly. Further, when a plurality of types of sets are switched and controlled using a single remote control transmitter each time, a format type switching operation must be performed frequently each time, which is very complicated.

An object of the present invention is to provide a control device for remote control transmitter, which eliminates the need for the user to switch the coding format type according to the set to be controlled by the remote control and solves the above-mentioned problems.

[0006]

A control device for a remote control transmitter according to the present invention comprises a key reading means for reading operation states of a plurality of keys, and a key code generating means for generating a key code from the read operation states of the keys. , Key code encoding means for sequentially encoding the key code in a plurality of predetermined formats, carrier signal generating means for generating a carrier signal, and modulating the carrier signal with the encoded signal to output from an output terminal And a modulation means for performing.

[0007]

In the controller for remote control transmitter of the present invention, the key reading means reads the operation states of a plurality of keys, and the key code generating means generates a key code from the read operation states of the keys. The key code encoding means sequentially encodes the key code in a plurality of predetermined formats. The carrier signal generating means generates a carrier signal of a predetermined frequency, and the modulating means modulates the carrier signal with the encoded signal and outputs it from the output terminal.

As described above, even when a certain single key is selected, the key code to be transmitted is sequentially encoded in a plurality of predetermined formats and transmitted.

Therefore, if the set includes a remote control receiver corresponding to any one of the plurality of formats, the remote control transmitter using this remote control transmitter control device does not switch the format type. It becomes possible to operate.

[0010]

1 is a block diagram showing the configuration of a control device for a remote control transmitter according to an embodiment of the present invention. In FIG. 1, reference numeral 20 denotes a control device for remote control transmitter, which is configured as, for example, a single-chip C-MOS LSI. In FIG. 1, the oscillator circuit 1 and the oscillator circuit 2 have ceramic oscillators 21 and 22 connected to the outside, respectively, and output original oscillation signals of different frequencies. The oscillation signal of the oscillation circuit 1 is used as a system clock signal. CPU11 is ROM8
The program previously written in is executed to perform various processes described later. RAM9 edits the data to be sent,
Used as various working areas. The internal control latch 7 is a circuit for outputting a signal to each of the oscillation circuit 1, the oscillation circuit 2, the flip-flop 3, the switching circuit 4, the frequency dividing circuit 5 and the AND gate 6, and the CPU 11 via the internal control latch 7. A control signal is given to each part. The flip-flop 3 is reset by a signal from the internal control latch circuit 7 and set by a key input signal described later. This flip-flop 3
Is for outputting the oscillation start / stop signal of the oscillation circuit 1,
The oscillation circuit 1 starts oscillation when the flip-flop 3 is in the set state, and stops oscillation when the flip-flop 3 is in the reset state. The oscillator circuit 2 performs an oscillation start / stop operation according to a signal given from the internal control latch circuit 7. The switching circuit 4 selects one of the signals of the oscillation circuits 1 and 2 according to the signal of the internal control latch circuit 7 and supplies it to the frequency dividing circuit 5. The frequency dividing circuit 5 switches its frequency dividing ratio according to the output signal of the internal control latch circuit 7. Further, the AND gate 6 interrupts the output signal of the frequency dividing circuit 5 by the output signal of the internal control latch 7. A key switch 23 is connected to the I / O port 10. The key switch 23 is a matrix circuit, and the CPU 11 is the I / O port 10.
A strobe signal is output to the key switch 23 via and the return signal is read. The drive circuit 24 drives the infrared LED 25 according to the output signal of the AND gate 6.

In the control device for remote control transmitter shown in FIG. 1, an encode signal for modulating a carrier signal is input from the internal control latch circuit 7 to the AND gate 6, and the frequency of the required carrier signal is switched by the switching circuit 4. And the frequency dividing circuit 5 are switched by changing the frequency dividing ratio. In the power save state, the flip-flop 3 is in the reset state, the signal from the internal control latch circuit 7 to the oscillation circuit 2 is also in the oscillation stop state, and the control device for remote control transmitter is composed of the C-MOS circuit. The overall power consumption of 20 is extremely low. If any key of the key switch 23 is operated in this state, the flip-flop 3 is directly set and the oscillation circuit 1 starts oscillation, whereby the system clock is generated, and the CPU 11 is pre-written in the ROM 8. After the execution of the stored program is started and a series of processing is completed, the flip-flop 3 is reset to be in the power save state again.

Next, FIG. 2 shows an example of coded format data which is written in advance in the ROM 8 shown in FIG. As shown in FIG. 2, the types of formats are provided from the 1st to the mth, and the coding formats (PIM, PW
M, PPM, etc.), bit length, header code (data of the reader portion), basic pulse width, pulse width of data “1”, carrier frequency and the like.

An example of the key code data table in the ROM 8 is shown in FIG. As shown in FIG. 3, the key codes are provided from the first to the nth, and the key codes used in the first format, the second format, the third format, ... Are written in advance for each key.

Next, FIG. 4 shows a processing procedure of the CPU 11 shown in FIG. 1 as a flowchart. This process is started when any key operation is performed. First, the operated key is read, the data in the first coded format (see FIG. 2) is read, and the key code of the operated key is read from the key code data table shown in FIG. 3 to obtain the first code. Send in encrypted format. Then, the data in the second coded format is read out, and a key code suitable for the second coded format is encoded and transmitted. Similarly, the third coded format data is read, and a key code suitable for the format is encoded and transmitted. After that, the flip-flop (flip-flop 3 in FIG. 1) is reset to return to the power down mode. If the same key is continuously pressed, then the same processing is performed again from the first processing shown in FIG.

In the embodiment, the carrier frequency is also switched according to the coding format, but the commonly used carrier frequencies are relatively close to each other even if the coding format is different, and Since the Q of the bandpass filter on the receiver side is also low, it may be fixed at an average carrier frequency.

[0016]

According to the present invention, a remote control transmitter incorporating the control device for a remote control transmitter according to the present invention can be used to switch a plurality of sets having different coding format types from each other. You will be able to control the remote control.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a control device for a remote control transmitter that is an embodiment of the present invention.

FIG. 2 is a diagram showing an example of coded format data in a ROM.

FIG. 3 is a diagram showing an example of a key code data table in a ROM.

FIG. 4 is a flowchart showing a processing procedure of a CPU.

[Explanation of symbols]

20-Control device for remote control transmitter (single chip LS
I)

Claims (1)

[Claims] 1. Key reading means for reading operation states of a plurality of keys, key code generation means for generating a key code from the read operation states of the keys, and the key codes are sequentially encoded in a plurality of predetermined formats. A remote control transmitter control device comprising: a key code encoding unit for generating a carrier signal; a carrier signal generating unit for generating a carrier signal; and a modulating unit for modulating the carrier signal with the encoded signal and outputting the modulated carrier signal from an output terminal. .